autoNotion – Finding a submarine that doesn’t want to be found is one of the most expensive problems in modern defense. Norway spent most of 2025 shopping for an answer and picked at least five British-designed Type 26 frigates, a deal Breaking Defense put at roughly $13.5 billion, which works out to about $2.7 billion per hull. A Munich company called Helsing thinks the future of the hunt looks less like a 6,900-ton warship and more like hundreds of 132-pound (60 kg) gliders drifting along at walking pace, each one running an AI that was trained the way you’d train a chatbot, except on decades of recorded ocean sound instead of internet text.

(Thanks to Alain)

The War Zone – Pairing uncrewed underwater vehicles and SEALs in submersibles opens the door to new operational possibilities, but there are challenges.

Interesting Engineering – A European defense technology company has just unveiled the world’s longest-endurance unmanned submarine, which can remain submerged for up to four months without the need for a support vessel.

(Thanks to Alain)

UK Defence Journal – Australian company C2 Robotics has commissioned and christened its first Speartooth Large Uncrewed Undersea Vehicle delivered to the United States.

(Thanks to Alain)

Interesting Engineering – A Canadian company’s submarine drone has traveled more than 1,257 miles fully submerged, powered by hydrogen fuel cells, and completed a 385-hour mission without surfacing.

(Thanks to Alain)

National Defense – New York-based drone manufacturer Cardona Marine Group Inc. is developing a new class of stealth maritime drones that can attach to and attack adversary submarines and ships both underwater and at the surface.

(Thanks to Alain)

Naval News – Lockheed Martin rapidly developed its new Lamprey multi-mission autonomous undersea vehicle: The company took just 14 months to develop Lamprey, with future plans to field larger variants and another drone by the end of the year. 

The War Zone – Lamprey can launch aerial drones, launch decoys, and fire torpedoes after arriving discreetly in an operating area by hitching a ride.

Defense News – Governments and militaries in Southeast Asia are turning to autonomous underwater tech to monitor subsea cables after a series of damaged infrastructure in the Baltic Sea, and recently, in sea lanes surrounding Taiwan.

Naval News – Seafaring nations face unique challenges in ensuring the safety, security and sovereignty of their nautical frontiers. Even in times of tranquility they must guard against threats such as terrorism, smuggling, illegal fishing, natural resources theft, and uncontrolled mass immigration. And when conflict does arise, these nations must have anti-submarine and anti-surface vessel warfare capabilities to defend against naval incursion or attack. Even before the outbreak of open hostilities, it is imperative that they be able to detect and track hostile naval forces engaged in intelligence gathering and other covert activities.

(Thanks to Alain)

Clio’s Musings – A propulsion disabler (PD) is a small, passive, torpedo-like device that serves as a cheap, non-lethal mine and torpedo warhead. The proposed munition’s purpose is to destroy a ship’s external propulsion or direction-control mechanisms, leaving the vessel stationary. Production of PDs is possible with today’s emerging robotics technologies.Future PD devices could be used in an autonomous swarm that combines the smallest explosive charge with the greatest disabling effect by attacking a ship at its most vulnerable point. Once PDs become widely available, they may well be the weapon of choice by all navies against civilian ships. Similarly, disabling an enemy’s naval ship rather than sinking it will almost always be the superior choice, certainly for the U.S. Navy. The logic that makes this so will compel adversary navies to make the same choice.

Breaking Defense – Defense and information technology company Leidos this week unveiled a new unmanned undersea vessel called Sea Dart, what the company is advertising as a “low-cost,” versatile maritime weapon.

(Thanks to Alain)

Naval News – Anduril showcased an integrated series of autonomous underwater vehicles and sensors at Sea Air Space 2025, which the defense contractor described as its answer to the “new rules” of maritime sea power. 

Defense News – Anduril Industries unveiled a new family of autonomous underwater vehicles called Copperhead, designed to meet military and commercial needs for larger fleets of uncrewed maritime vessels.